RESTRUCTURING - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 30, 2024 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 101
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Cash implementation costs	1
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Cash implementation costs	5
North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 31
Employee Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	37
Asset related costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4
North America Frozen Supply Chain Network Reconfiguration
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	50
North America Frozen Supply Chain Network Reconfiguration | COGS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	31
North America Frozen Supply Chain Network Reconfiguration | Employee Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	10
North America Frozen Supply Chain Network Reconfiguration | Asset related costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	30
North America Frozen Supply Chain Network Reconfiguration | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	10
European Cereal Supply Chain Network Reconfiguration
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	120
European Cereal Supply Chain Network Reconfiguration | COGS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	70
European Cereal Supply Chain Network Reconfiguration | Employee Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	50
European Cereal Supply Chain Network Reconfiguration | Asset related costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	40
European Cereal Supply Chain Network Reconfiguration | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 30